Grinding machine



A.'J. STRONG GRINDING MACHINE Filed Feb. 16. 1929 Junev 14, 1932.

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Patented June 14, 1932 g 1,862,8ea

UNITED STATES PATENT yorricia:

ARTHUR J. STRONG, F DETROIT, MICHIGAN GRINDING MACHINE Application filedFebruary 16, 1929. Serial No. 340,497.

byuse of like characters which are employed to designate correspondingparts through- 1n Fig. 3 it Will be seen that tlie inacliine is built ona base 1 having at one end a translips of the lutes or blade will not betrimmed base.

to the radius of the tool but yvill be ground down behind the cuttingedge in order to proverse guide iii which slides a support 3 carryingthe griiidstone 4. .screw turns loosely ina collar 6 depending from thesupport 3 and threads through a nut 7 supported by the base 1, wherebythe grindstone may be adjusted transversely of the An adjusting The baseis formed with still another gude or u'ay 8 in iront of the stone forsupportvide clearance beliind'this edge. This obing a carriage 9 whichslides longitudinally ject is accomplished essentially by mounting otthe base. The lower portion of the carthe tool in a clamp supported on acarrier which in turn is adapted to swing on an axis eccentric of theclamp. y The carrier is swung downwardly during the grinding operation,

riage carries a rack 1t), and iii the base 1 is joui'naled a. shaft 11carryng at one end a hand Wlieel12 and at the other end a pinion 13meshing with the rack 10. By th .s means, the

as a result of which a convex tip is formed, carriage may readily beadjusted longitubound on one side by the cutting edge and dinally of thebase.

on the other side by a rear edge which is at a less distance from thecenter of the too'l than 115 is the cutting edge.

The invention further embodies various adjustments for the severalpartsas ivell as other objects and advantages, all of which are fullydisclosed by Way of example in the following description and in theaccompanying drawings in which Figure 1 is a fragmentary plan view ofthe machine, partly in section;

Fig. 2 is an elevation thereof;

Fig. 3 is a detail transverse section, partly in elevation;

Fig. 4 is a section on t Fig. -5 isa detail plan View showing a dress-'ing instrument applied to tli'e machine;

FigQ is an elevation at the side opposite lhat'shoivn in Fig. 2; and

Fig. 7 is a diagrammat movement'of the carrier relative to thegrindstone.

The base supports a pair of upright bearings 15 at its ends to provide aswivel mounting for a pair of arms 1G having journals 17 extending intothese bearings. To the inner faces of the ai'nis 16 ai'e attached platesl5 by means of bolts 19, for a purpose which will presently appear. Theplates are formed with double or oppositely extending hubs 20 whichreceive a rod or shaft 21 lying longitudinally of the carriage at theforward edge thereof. The outer/end of each hub extends into theadjacent arin 16, and the two inner ends serve to support a carrier body22 which i, encloses the iod 21. The inner ends of the he llneA-i-Oli1g' 1 hub are further 'secured to the rod 21 by means of pins 23asclearly shown-in Fig. 1. Each end of the liollow'rod 21 contains aplug 24 with a liole or socket in Which is reje View Showing the vceiveda split conical member 25, having a,

` "stem 2G extending outwardly beyond the adjacent' arm 16. The stem issurrounded b lReference to these views will now be had a disk 27 andagi'ooved cani 28 against whic the socket member 24 is drawn by r. nut29 threaded on the extremity of the stem 26.

It will now be evident that the carrier assembly is adapted to swing inthe bearings 15. However, it is normally held in a raised position bybow springs 30 wound around studs 3l on the bearings 15 and having oneend in engagement with the corresponding grooved cam 28 and the otherend resting in a seat 3l on the carriage 9 (Fig. 3). The upward movementof the carrier is limited by a set screw 32 adjustable in a lug 33extending from one o'l' the bearings and engagcable by a lug 34extending from the adjacent arm 16 as shown in Figs. 1 and 4. Thetension of the springs is regulated by adjusting the cams on thestems26, inasmuch as the cams may be locked in any desired position by meansof the nuts 29.

To the side of the body 22 facing the stone 4are secured a pair ofarcuate guides 35 by means of bolts 36. These guides form an arcuate wayfor a carrier plate 37 therebetween and pivoted at its midpoint to thecarrier body by a stud 38. The plate 37 in turn carries a pair ofbearing brackets 39 adjustable thereon and supporting longitudinallyadjustable centers 40 which are arranged eccentrically of the journals17. The tool 41 to be sharpened is mounted on a mandrel 42, the ends ofwhich are held by the centers as shown in Fig. 1.

Upon the carrier bodv 22 is mounted a short track member 43 in which oneend of an arm 44 is adjustably held by a clamping bolt and nut 45. Thearm extends over the tool 41 and carries a slidable block 46 in which isadjustably mounted a stop linger 47 adapted to engage the upper surfaceof the finger of the blade 48 which is diametrically opposite the bladein contact with the stone, as shown in Fig. 3'. The inner extremity ofthe arm 44 carries a swingable gauge 49 which determines the position ofthe blade engaging the` stone.

In the operation of the device as thus far described, it will beseenithat one of the flutes or blades to be ground is brought intocontact with the stone 4. In the normal position of the carrier andtool, as indicated by dot and dash lines in Fig. 7, the stone 4 forms aconvex edge on the blade or finger 48 in contact therewith. As thecarrier is depressed against the action of the springs 30, the toolmoves in an arc eccentric of its centers 40, whereupon the trailing edgeof the blade is brought closer to the stone and ground down, while theleading or cutting edge is retracted from the stone, as shown in fulllines in Fig. 7, with the result that the blade is formed with a convextip 48 having its trailing edge at aless distance from the center thanthe leading edge, thereby providing clearance behind the leading orcutting edge. l

After a blade- 48 has been thus ground, the

carrier body is swung upwardly around the hub members 20, bringing thetool well away from the grindstone so that it may safely be adjusted forgrinding another blade. The stop 47 is withdrawn, and the gauge 49 swungaway from the tool, so that the latter may be turned to present anotherblade or to bring another bladein a position to be worked upon f tionwhich brings the blades parallel to theI axis of the grindstone. Theadjustment of the plate is permitted by loosening the bolts 36 which aretightened again after the proper angle'of compensation has beendetermined by means of 'graduations 50 on one of theV guides and anindex 50 on the end of the carrier plate adjacent thereto.

The grindstone 4 is here illustrated as hav-- ing a fillet 51 at oneedge for rounding off one of the ends 'of the cutting edge of eachblade.

The blade first lies entirely along the cylindrical surface of thegrindstone but is subsequently carried to the fillet 51 by the meanswhich will now be described.

One of the journals 17 (Fig. 1) has its outer end cut at an angle toform a cam 52. stem 53 extends from this journal. through a cam member54 held in the corresponding bearing 15 by bolts 55 and adapted tocooperate with the cam face 52. The outer extremity of the stem 53carries -a nut 56 and is surrounded by a compressed spring 57 bearingagainst the member 54 and the nut 56 to draw the cam face 52 against thecam 54. Consequently, on depression of the carrier and rotation of thejournals in themanneralready described, the contacting cam faces shiftthe carrier and hence the tool 41 toward the fillet 51, so that one endof thecutting edge is rounded olf.

The curvature of the tip 48 of the blade depends on the distance betweenthe axes of the journals 17 and the clamping centers 40. In order tovary the curvature of the tip for various requirements, the axes of thecenters 40 may be adjusted with reference to the axes of the journals17. To this end, each of the bolts 19 works in a slot 58 in the adjacentplate 18. Each plate is also formed at its inner end with a notch 59receiving a stud 60 extending from the adjacent arm. By loosening thenuts 19, the plates 18 may be adjusted relatively to the arms 16. Thecarrier body 22 which is rotatable on the hubs 2O tends to swing becauseof the weight of the bearings 39 and follows the adjustment of theplates 18 by reason cooperating with stop pins 62 extending from theplates.- The desired adjustment may determined by insertingcorrespondingly d1,.

mensioned shinis lin each notch 59 over thestud 60 and bringing thestuds, shims and- -upper walls o the notches into mutual contact by setscrews 63 threaded through the l bottom walls of the notches andengaging the studs.

In Fig. is illustrated adevic'e fora dressing the face of the grindstone4. One of lthe bearings 39 carries an ear 64 to which is pivotallattached an arm 65 extending to a point a jacent the other bearing 39. o

` base 1 of the machine is secured a bracket 66 bearing 39 andthere'equip.

adjacent the last named ed with a guide 67- conforming to the pro le ofthe stone.

extending toa point The guide is detachable by means of screwsv 68 sothat it may readily be replaced by of notches 61 in the ends thereofthe- 3., Ina grinder its journals.

In testimony whereof I aix m si ature. ARTHUR J. TR NG.

other guides for various styles of stones..

The free endof the arm 65 carries a in or roller 6 9 adapted to ridealong the gui e, and to an intermediate point of the arm is se cured adressing instrument 70, such as a sharp pointed member or a diamondpoint, adapted to run across the face of the stone. This instrument isnormally urged into contact with the stone byl means of a spring 71connecting the arm 65 to the bracket 66. TheA transverse movement of theinstrument with v respect to the stone is obtained by operating carrierpivotally and sli ablysupp `of said members bein being movable with saidcarrier to move 'the' swung on its pivotal axis.

the hand wheel 12 which results in the movement of the carriage 9 andbearings' 39 axially of the stone.

- .Although a specific embodiment of the invention has been illustratedand described, it

.will be apparent that various alterations in the details ofconstruction may' be made .without departing from the scope of theintowards said illet as the carrier is swung on 75 ventionV as mdicatedby the appended claims.

1. In a grinder for use in conjunction with a grind'stone havin afillet, a base, a orted 'by said base, clamping means on said carrierfor holding a work piece to be ground,

means for adjusting said'clamping means 1n an eccentric relation to thepivotal center of said carrier, co-operatin cam members, one

xed and the other armer towards said llet as the carrier is 2. In agrinder for use 1n a grindstone having a fillet, a base, a; carrierconjunction with pivotally and slidably supported by said base, clampingmeans on said carrier for holding a work piece to be ground, means foradjusting sai centric relatlon to the pivotal center of said clampingmeans in an eccarrier, and means operable on pivotal movel 'ment o saidcarrier for sliding the carrier towards said fillet.

